sw/device/lib/testing/test_framework/kelvin_gloss.c

/*
 * Copyright 2023 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/* Syscall stubs for newlib on Kelvin */
#include <errno.h>
#include <sys/stat.h>

int _close(int file) { return -1; }

int _fstat(int file, struct stat* st) { return 0; }

int _isatty(int file) {
  errno = ENOTTY;
  return 0;
}

int _lseek(int file, int ptr, int dir) { return 0; }

int _read(int file, char* ptr, int len) {
  errno = EBADF;
  return -1;
}

int _write(int file, char* ptr, int len) {
  errno = EBADF;
  return -1;
}

int _open(const char* path, int flags, ...) { return -1; }

void _exit(int status) {
  while (1) {
  }
}

int _kill(int pid, int sig) { return -1; }

int _getpid(void) { return -1; }

// Based on newlib's nosys sbrk
void* _sbrk(int bytes) {
  extern char __heap_end__;
  static char* heap_end;
  char* prev_heap_end;

  if (heap_end == 0) {
    heap_end = &__heap_end__;
  }
  prev_heap_end = heap_end;
  heap_end += bytes;

  return (void*)prev_heap_end;
}